I'll be stopping at home depot tomorrow for some dremel cutting disks and I'll be cutting the cage down to 3 bays and mounting it so the drives are horizontal. Then I'm securing it back to the case with 4-40 screws + nuts.

If I make a mess of the drive cage and it ends up FUBAR then I'll convert 2 5.25" bays into 3.5" drive bays. I'll just be using painter's tape and a dremel to cut the steel cage and hope that it works. Not too sure how it should be done as this is my first mod.